Google+ offers the ability to mail people in your circles once. First, select the person you wish to email. Find their Google+ account and add them to your circles. Next, simply log in to your Gmail account and type their name in the address bar. Their Google + profile pops up. However, you will not be able to see the email address. If the person replies to the mail, you will see their email address and can continue the conversation. If they don’t reply, you won’t be able to mail them again. Ouch!